Snap lock constructions



-Sheet 1 INVENTOR.

3 Sheets FIG-5 E. J. DE RIDDER SNAP LOCK CONSTRUCTIONS ERNST J DeRlDDER BY r A/ ///4 H18 ATTORNEYS March 28, 1967 Original Filed May 11, 1961 March 28, 1967 E. J. DE RIDDER 3,310,923

SNAP LOCK CONSTRUCTIONS Original Filed May 11, 1961 v 3 Sheets-Sheet 2 INVENTOR. ERNST J. De RI DDER BY T4 70 w %2%M ,4 HIS ATTORNEYS Original Filed May 11, 1961 March 28, 1967 E. J. DE RIDDER 3,310,923

SNAP LOCK CONSTRUCTIONS 3 Sheets-Sheet 3 FIG- l2 FIG-I3 INVENTOR.

ERNST J. DeRIDDER BY HIS ATTo'RNEYs United States Patent 6 Claims. (Cl. 52-502 This application is a continuation of Ser. No. 109,438, entitled, Snap Lock Constructions and Method of Assembling the Same, filed May 11, 1961, now abandoned.

This invention relates to snap lock constructions and the like which are produced in connection with relatively simple extruded components. These components may be used efficiently to erect various building constructions, such as ship deck houses and the like.

Frame members, partitions and locking members of this invention are readily extruded, rolled or otherwise formed as desired, and are readily assembled together in an eflicient and secure manner.

The frame members have partition receiving flanges which also have hook receiving ledges. The frame members also have fulcrum receiving flanges with fulcrum receiving ledges which receive fulcrum edges of the locking members. The locking members may also have partition engaging plates and hook edges which hook with the hook receiving ledges and hold the partions against the partition receiving flanges.

This produces a very eflicient snap lock construction.

Accordingly, it is an object of this invention to provide a building construction having one or more of the features herein disclosed.

Another object of this invention is to provide components having one or more of the features herein disclosed.

Another object of this invention is to provide a method of assembling a building or the like and having one or more of the features herein disclosed.

Other objects of this invention are apparent from this description and/ or the accompanying drawings, in which:

FIGURE 1 is a vertical cross section of an embodi ment of this invention.

FIGURE 2 is a cross section along the line 2-2 of FIGURE 1.

FIGURE 3 is an embodiment similar to FIGURE 1, but showing a slightly different locking member.

FIGURE 4 is an embodiment similar to FIGURE 3, and showing a further different locking member.

FIGURE 5 is another embodiment somewhat similar to FIGURE 3, but showing another embodiment of the locking member.

FIGURE 6 is a cross section of a frame member and locking member suitable for use in locking the corner joint of two partitions.

FIGURE 6A is an elevation of the locking member of FIGURE 6.

FIGURE 7 is a cross section of a corner construction somewhat similar to FIGURE 6 but showing a slightly different embodiment.

FIGURE 8 is a cross section of a construction suitable for use as a keel in a ship or the like.

FIGURE 9 is an elevation of a locking member slightly different from that shown in FIGURE 8, but applicable to the frame member of FIGURE 8.

FIGURE 10 is a diagrammatic vertical cross section of a ship and deckhouse which may be constructed largely of the components shown in the various figures of this application.

FIGURE 11 is a cross section or elevation of a par- 3,310,923 Patented Mar. 28, 1967 ice tition made of channel members for use with this invention.

FIGURE 12 is a diagrammatic view of another ship construction and deckhouse construction.

FIGURE 13 is a typical cross section of a frame and partition construction somewhat similar to that shown in FIGURE 1, but with a slanting construction applicable to FIGURE 12.

Certain adjectives and other words of directional description are used herein, such as upper, lower, sidewise, vertical, horizontal, etc. These words or adjectives are used for brevity of description. However, it is to be understood that such words have not been used for limitation, and that the members described thereby may be in other positions or directions than those specifically mentioned by these words.

This invention may be used in connection with various building constructions, such as ship constructions with deckhouses and similar constructions.

Referring first to FIGURES 1, 2 and 10, a ship or other construction may have a frame member 20 which may have first, second and third frame flanges angularly disposed with respect to each other and indicated respectively by numerals 22, 24 and 26. The flanges 22 and 26 may be partition receiving flanges. The flange 24 may be substantially at a degree angle with respect to both the flanges 22 and 26 and may be a fulcrum receiving flange.

The first frame flange 22 may have a partition or deckhouse sidewall receiving frame surface 28 and a hook receiving ledge 30 adjacent to the partition receiving frame surface 28. The second frame flange 24 may have a fulcrum receiving ledge 32.

A partition or deckhouse sidewall 34 may have one partition side 36 adjacent to the partition receiving frame surface 28. The partition 34 may also have the other partition side 38 exposed for engagement by a locking member 40.

The locking member 40 may have a parition engaging plate 42 with its engaging plate side 44 engaging said other partition side 38. The locking member 40 may have a hook edge 46 engaging and hooking said hook receiving ledge 30 of the flange 22.

The locking member 40 may have a fulcrum plate 48 integral with the partition engaging plate 42 and having a fulcrum edge 50 engaging said fulcrum receiving ledge 32. The ledge 32 may have a groove 51 to receive the fulcrum edge 50.

The locking member 40 may be forcibly deformed, as by hammering at 54, into locking engagement with the frame member 20 and partition 34.

The partition receiving frame surface 28, the partition sides 36 and 38, and the partition engaging plate side 44 may be adhesively secured together, as indicated by the numeral 52 wherever such numeral 52 is applied. The adhesive may be applied to one or both of the adjoining surfaces before the parts are locked together.

The third frame flange 26 may be integral with the first frame flange 22 and may be oppositely directed from said first frame flange 22 at an angle of degrees, or any other desired angle. The third frame flange 26 has a second partition receiving frame surface 28A and a second hook receiving ledge 30A adjacent to said second partition receiving frame surface 28A. The second frame flange 24 has a second fulcrum receiving ledge 32A. A second partition or deckhouse sidewall 34A is oppositely directed from said first named partition 34 and has one second partition side 36A adjacent said second partition receiving frame surface 28A. The second partition 34A also has its other second partition side 38A exposed for engagement by a second locking member 40A. The secnd locking member has a second partition engaging plate 42A with its engaging second plate side 44A engaging or engageable with said other second partition side 38A and With a second hood edge 46A engaging or engageable and hooking or hookable with said second book receiving ledge 30A.

Said second locking member 40A has a second fulcrum edge 50A which engages said second fulcrum receiving ledge 32A, which has a groove 51A.

The second locking member 40A may be forcibly deformed or deformable, by hammering or the like at 54, into locking engagement with the frame member 20 and with said second partition 34A in a manner similar to the joining procedure at first frame flange 22.

In FIGURE 1, the second locking member 40A is shown in full lines in a position to be deformed by hammering or the like. This may be accomplished by hammering upon the head 54, upwardly in FIGURE 1, to deform and force the locking member 40A into a position corresponding to that shown with respect to locking member 40, whereby the hook 46A will be hooked over the ledge 30A, and the side 44A will be brought into engagement with the side 38A. However, previously to this deformation, adhesive may be applied to the side 44A (and the side 38A, if desired), as well as to the sides 28A and 36A, so that when the locking member 40A has been driven into locked position, the sides or surfaces 28A, 36A, 38A and 44A will be adhesively secured together in a manner similar to the corresponding surfaces at the upper part of FIGURE 1. However, only one of each of the adjoining surfaces need be covered with adhesive, if desired.

If desired, the partitions 34 and 34A, the locking members 40 and 40A, and the flanges 22 and 26 may be made the same in detail, but oppositely directed. That is, there are mirror image constructions on both sides of flange 24.

FIGURE 2 shows a cross section transverse to FIG- URE 1, taken along the line 22 of FIGURE 1. The description heretofore given applies to partitions 34, locking member 40 and flange 22 and other members with reference numerals used in FIGURE 1. The same description also applies to the partition 34A, locking member 40A, and flange 26 as is readily understood, and therefore a description of the partition 34A, locking member 40A, and flange 26 is not repeated, since such description would merely add the capital letter A to the reference numerals used on the members above flange 24.

In FIGURES 2 and 11, partition 34 may be made of a plurality of interlocked channel partition members 56, each having respectively a main flat body 58 and two partition member flanges 60 and 62. The channel members 56 are interlocked at 64 and 66. The locking construction at 64 includes a tongue and groove arrangement 68. The locking construction at 66 includes a hook 70 and a straight locking edge 72 respectively on flange bends 74 and 76, which are connected to the flanges 62 and 60, respectively.

The channel partition members 56 are interlocked by having adjacent channel members 56 slanting with respect to each other, as shown in FIGURE 11, before they are applied to the frame members 20 and 20F, so that the tongue and groove construction 68 may be preliminarily engaged and thereafter the channel partition members 56 are aligned or swung or pivoted about construction 68 to bring the flanges 60 and 62 and the flange bends 74 and 76 into contiguous relationship with the hook 70 hooking over the straight edge 72 in locking engagement. Suitable tools may be used for forcing the members 60, 62, 74, 76 and 70, 72 into contiguous engagement.

The main flat body 58 of the respective channel partition members 56, FIGURES 2 and 11, each forms a part of said one partition side 36, FIGURE 1, which is adjacent to said partition receiving frame surface 28.

The other partition side 44 is also made from each respective main flat body 58 and such composite partition side 44 is exposed for engagement by a plurality of locking members 40.

There are a plurality of locking members 40 which engage the parts of the various partition sides 44 which lie respectively between said partition member flanges 60 and 62. That is, there is a locking member 40 for each interlocked channel partition member 56, and each of these locking members 40 are placed between the flanges 60 and 62 of each channel partition member 56.

FIGURE 6 shows a corner construction which may have part of the same description which has been correspondingly applied to the upper part of FIGURE 1. However, to make the description of FIGURE 1 apply to FIGURE 6, FIGURE 1 should be considered as having been rotated clockwise for 90 degrees, so that the first frame flange 22 of FIGURE 1 corresponds to the first frame flange 22C of FIGURE 6. Likewise, the second frame flange 24 of FIGURE 1 corresponds to the second frame flange 24C of FIGURE 6. Other members of FIGURE 6 which correspond to similar members of FIGURE 1 have been designated by the reference numerals 46C, 30C, 28C, 36C, 44C, 34C, etc. Also fulcrum 50 of FIGURE 1 corresponds to fulcrum and hook 56C of FIGURE 6. Fulcrum ledge 32 of FIGURE 1 corresponds to fulcrum ledge and combined hook receiving ledge 32C of FIGURE 6. The second flange 24C of FIGURE 6 has been provided with another partition receiving frame surface 28D. Another partition 34D is adjacent to said another partition receiving frame surface 281). Said another partition 34D has another partition side 44D exposed for engagement by another partition plate 42D to engage said another partition 34D. Members 38D, 36D, 42D, and 44D have structures which are similar to members 33, 36, 42, and 44 of FIG- URE 1.

FIGURE 6A shows the locking member of FIGURE 6 by itself. The hook 46C may be placed adjacent the ledge 30C, and if necessary, the locking member 40C may first be hammered at 41 to place the hook 46C adjacent the ledge 30C. The locking member 40C may first be engaged at the fulcrum ledge 320 by hammering at 41A, and thereafter the surface 41 may be hammered to drive the hook 46C in place. In this construction either 46C or 50C may be considered the fulcrum and/ or the hook member as is obvious.

Many of the members of FIGURE 7 may be compared to similar members of FIGURES 1 and 6 where FIGURE 1 has been rotated clockwise. Certain members are identical in function with the members of FIGURE 6, which also have been compared with FIGURE 1. For example, the following members of FIGURE 7 may have the same function as in FIGURE 6: 34C, 23C, 22C, 46C, 36C, 44C, 30C, 24C, 32C, 38D, 44D and 34D. However, a fulcrum piece 42L may have a hook at 59L and a fulcrum ledge 32L into which the fulcrum 50M is inserted. After these members have been assembled as shown in FIGURE 7, the joining piece 48L may be hammered at 49L to deform and drive the members in locking engagement.

The parts at the bottom of FIGURE 1 may be considered to be identical in operation and construction with a portion of part 24 and with parts above 24 in FIGURE 1, with the exception that the lower parts of partition 34 at the upper part of FIGURE 1 correspond to the lower parts of partition 34A at the bottom of FIGURE 1.

At the lower part of FIGURE 1, the member may be considered to be the deck of a ship or the like, such as shown in FIGURE 10. The frame member 20F may be the same as the upper part of frame member 20, and the flange 22F may be considered to be identical in func tion with the flange 22. The flange 24F may be considered to be identical with flange 24, except that all parts below the lower surface 25 of flange 24 have been cut away to produce the straight lower surface 25F of the flange 24F. However, frame member 20F may be madev directly as an extrustion without cutting parts of a frame member 20. A few of the parts at the bottom of FIG- URE 1 which correspond to those at the upper part of FIGURE 1 have been designated by similar numbers with the suffix F added and such members are not further described, since they may be identical to corresponding members at the top of FIGURE 1. The flange 24F may be secured to the deck 80 by a plurality of rivets 82, so that the flange 24F is securely held against the deck 80. All of the other unnumbered parts at the lower part of FIGURE 1 may be identical with similar parts at the top of FIGURE 1.

FIGURE 3 shows a construction substantially similar to that of FIGURE 1 and all of the parts of FIGURE 3 may be substantially identical with all of the parts of FIG- URE 1, whether shown or not in FIGURE 3. However, the locking members 40G of FIGURE 3 have been modified in comparison to the locking members 40 and 40A of FIGURE 1. The fulcrum plate 48G of FIGURE 3 is curved as shown in FIGURE 3, so that the fulcrum plate 48G may be hammered at the point 49 to deform the same into engagement with the partition 34. In this construction, if desired, the head 54 of FIGURE 1 may be omitted, so that no hammering need be made on the partition engaging plate 42, and the parts may be deformed merely by hammering at the point 49. In this case the fulcrum plate 48G may be originally curved sufflciently so the hook 50G and fulcrum 48G may be inserted in place without hammering, and then the plate 486 may be hammered at 49 to clamp the parts together.

In FIGURE 4, the construction may be substantially the same as in FIGURE 3, except that the hammering head 54 has been applied to the plate 42 and a hammering lug 53 has been provided at the place corresponding to 49 of FIGURE 3, where hammering may be done to deform the locking member. In FIGURE 4, hammering is first performed on the head 54 until the hook 46 has been engaged with the ledge 30, as shown in the upper part of FIGURE 4. Since the plate 42 of FIGURE 4 may have its partition engaging side 44H slightly curved or angled, as shown in the lower part of FIGURE 4, the lug 53 is hammered after the initial hammering at 54 has been completed. This hammering on the lug 53 straighten out the partition engaging side 44H into a straight construction, as shown in the upper part of FIGURE 4. All of the other parts of FIGURE 4 may be identical with FIGURE 1, and hence the description and illustration of such other parts are not repeated.

In FIGURE 5, the parts may be substantially the same as in FIGURE 1. However, the parts have been changed considerably, such as by providing undulations 84 and 86 in the flanges 22] and 261, which otherwise correspond to flanges 22 and 26 of FIGURE 1. Flange 24] may be substantially identical with flange 24. The locking member 40] may have a plate 42] and a hook 46]. However, the plate 42] may have undulations 88 and 90 which cooperate with the undulations 84 and 86 to lock the bottom of partition 34] therebetween. The locking member 40] may be hammered at head 54] into place, and, if desired, some further hammering may be provided, such as at the point 49, as in FIGURE 3. The partition 34] need not be made of a plurality of channels, as shown in FIGURE 4, but may be a single sheet which has had its edge rolled to provide the undulations 84 and 86 before assembly.

FIGURE shows a ship with a hull 90 of any desired depth and it may have a ship deck 80 to correspond with the ship deck 80 of FIGURE 1. A deck house 92, which may be rectangular or curved in plan view, may be placed on the deck 80. The deck house may be made with a lower deck house compartment 94 and an upper deck house compartment 96. The sidewalls of the lower compartment 94, which are shown partly in cross section and partly in elevation in FIGURE 10, may be produced as shown in the lower part of FIGURE 1, while the 6 sidewalls of the upper compartment 96 may be formed by the sidewalls shown in the upper part of FIGURE 1. The flange 24 and the floor construction 97 of FIGURE 1 may support the floor construction 97 of FIGURE 10. The corner joints at 98, 100, 102, etc., may be made as shown in FIGURES 6 and/ or 7, while the keel 103 may be formed as shown in FIGURE 8 or 9.

The floor construction 97 of FIGURE 1 and other similar figures may include a plurality of I or T beams 104with their upper flanges side by side and riveted at 106 to the extension 108 of flange 24.

A roof 107 maybe provided of any suitable construotion.

FIGURE 8 shows a construction which may be used as the keel 103 of FIGURE 10. The keel piece 103 may have first, second and third flanges 110, 112 and 114 respectively. The first and second flanges and 112 may have respective first and second partition receiving frame surfaces and 122, and first and second hook receiving ledges and 127 respectively. First and second bottom forming partitions 116 and 118 are placed adjacent the said partition receiving surfaces 120 and 122. First and second locking member parts 124 and 126 have respective partition engaging surfaces and 142 and also have respective hook edges 129 and 131. The locking member parts 124 and 126 are forcibly urged by hammering deformable third locking member part 138 at 139 to force said partition engaging surfaces 140 and 142 into.

engagement with said partitions 116 and 118 and to force the hook edges 129 and 131 into hooked and wedging engagement with the hook ledges 125 and 127.

The third flange 114 forms the keel for the ship.

The parts 124 and 126 are placed on flanges 110 and 112. The deformable member part 138 originally is sufliciently bowed so ends 132 and 136 may be placed in hooks 128 and 130, after which the deformable member part 138 may be hammered at 139 to force the various parts into place.

FIGURE 9 shows a locking member somewhat similar to that shown in FIGURE 8. This member may be used similarly and with the frame members 110, 112 and 114 of FIGURE 8. The hook 124 of FIGURE 9 may be identical with hook 124 of FIGURE 8 and is adapted to hold a partition 116 substantially identically as in FIG- URE 8. The hook member 126A of FIGURE 9 is integral with the deformable locking member part 138A of FIGURE 9. The locking member part 138A may be hammered at 139A to lock the parts in place in a manner similar to FIGURE 8. The application of the construction of FIGURE 9 to the construction of FIGURE 8 is obvious since the remaining parts of FIGURE 8 are un-. changed. Hence it is believed the operation of FIGURE 9 is obvious and any further description is deemed unnecessary.

FIGURES 12 and 13 show how the various previous embodiments of this invention may be us d to produce a curved, cylindrical or frusto-conical deck house 94A.

If the deck house 92A is to be somewhat frusto-conical, the frame member 20Q and frame flange 24Q of FIG- URE 13 may be forcibly deformed by rolling or bending into a large arc or circle 142, FIGURE 12, by bolting or riveting the flange 24Q at 82 in the horizontal are or circle 142. The frame member 20Q may be made substantially similar to the frame member 20F of FIGURE 1 except that the flange 22Q of FIGURE 13 may be slanted inward slightly to impart the slant to the frusto-conical upper and lower sidewalls 94Q and 96Q of the deck house 92A. However, for some purposes, the flange 22Q may be considered substantially perpendicular to the flange 24Q.

The locking members 40Q of FIGURE 13 may be similar to any of the locking members of the previous embodiments. The locking members 40Q may be slightly changed during the hammering operation to accommodate the slanting wall construction.

The double frame member 20R may correspond to the frame member 20 of FIGURES 1, 3 and 4 or 201 of FIG- URE 5. The same slant heretofore described may be imparted to the flanges 22R and 26R of the frame member 20R to produce the frusto-conical construction, if desired. However, for some purposes, the flanges 22R and 26R may be considered substantially perpendicular to the flange 24R.

The floor 97 may be also bolted or riveted at 143 to an angle member 144, as well as at 106R to the floor support 108R as in previous embodiments.

The frame 20R may be forced into a circle by a rolling operation or by forcible curving or bending thereof.

A roof 107Q may be provided of any suitable construction substantially in the same manner as in FIGURE 10.

The side channel members 56Q may have their side flanges, corresponding to side flanges 60 and 62 of the previous embodiments infinitesimally bent to compensate for the circular, curved or conical construction. Likewise the side flanges corresponding to flanges 60 and 62 may be infinitesimally spread apart at their lower ends to compensate for the larger diameter of horizontal crosssections of the frusto-cone at the bottom as compared to the top. However, since the diameter of the horizontal cross-sectional circles of the frusto-cone are so large in comparison to the widths of the side channel members, these variations are substantially negligible.

A suitable rail 146 is diagrammatically illustrated, and it may be varied as desired.

Suitable doors, port holes, etc., not shown, may be used as desired.

The frame members and the channel members and other similar members such as the locking members may be formed by extrusion. The dies used for making such extrusions may be of a relatively simple nature. These extrusions may be made of any suitable material, such as aluminous material which may be commercially pure aluminum, or suitable aluminum alloys or other material which is relatively light and/ or non-corrosive in the presence of water and the like.

It is thus to be seen that relatively simple, efficient constructions and methods have been provided by thisv parallel to said second frame flange while having a flat 55 free end, said second frame flange having a fulcrum receiving ledge; a partition having one partition side adja- 8 cent said partition receiving frame surface and having the other partition side exposed for engagement by a locking member, said partition having an end engaging said ledge means and having said other partition side coplanar with said free end of said ledge means; and a locking member having a partition engaging plate with its engaging plate side engaging said other partition side and with a hook edge engaging and hooking said hook receiving ledge means, said locking member having a fulcrum edge engaging said fulcrum receiving ledge, said locking member to be forcibly deformed into locking engagement with said frame member and partition by first having its fulcrum edge engaging said fulcrum receiving ledge so as to fulcrum thereagainst in order to cause said hook edge to be forced into hooking engagement with said hook receiving ledge means and lock therewith while said plate compresses said partition against said partition receiving frame surface to lock said partition to said frame member, said hook edge having a cam surface for initially camming along said other partition side and onto said free end of said ledge means with a smooth transition therebetween whereby said hook edge can then hook with said ledge means after further fulcruming of said locking member.

2. A combination according to claim 1 in which said partition receiving frame surface, said partition sides, and said partition engaging plate sides are adhesively secured together.

3. A combination according to claim 1 in which said fulcrum edge is part of a fulcrum plate integral with said partition engaging plate.

4. A combination according to claim 1 in which said fulcrum edge is part of a fulcrum plate integral with said partition engaging plate, and in which said fulcrum plate is curved to be forcibly deformed while said locking member is being forcibly deformed into locking engagement With said frame member and partition.

5. A combination according to claim 4 in which said fulcrum plate has a lug to be hammered to be forcibly deformed, and said partition engaging plate has a head to be hammered to deform said locking member.

6. A combination according to claim 1 in which said first flange, said partition and said partition engaging plate have undulating surfaces which aid in locking them together.

References Cited by the Examiner UNITED STATES PATENTS 2,266,593 12/1941 Emmons 287-18936 X 2,970,397 '2/ 1961 Roseman 40-156 2,983,002 5/1961 McEvoy et a1. 52-455 FOREIGN PATENTS 1,105,961 7/1955 France.

FRANK L. ABBOTT, Primary Examiner.

R. S. VERMUT, Assistant Examiner. 

1. IN COMBINATION: A FRAME MEMBER HAVING TWO ANGULARLY JOINED FIRST AND SECOND FRAME FLANGES, SAID FIRST FRAME FLANGE HAVING A PARTITION RECEIVING FRAME SURFACE AND A HOOK RECEIVING LEDGE MEANS ADJACENT SAID PARTITION RECEIVING FRAME SURFACE, SAID HOOK RECEIVING LEDGE MEANS BEING SUBSTANTIALLY PERPENDICULAR TO SAID FIRST FRAME FLANGE AND PARALLEL TO SAID SECOND FRAME FLANGE WHILE HAVING A FLAT FREE END, SAID SECOND FRAME FLANGE HAVING A FULCRUM RECEIVING LEDGE; A PARTITION HAVING ONE PARTITION SIDE ADJACENT SAID PARTITION RECEIVING FRAME SURFACE AND HAVING THE OTHER PARTITION SIDE EXPOSED FOR ENGAGEMENT BY A LOCKING MEMBER, SAID PARTITION HAVING AN END ENGAGING SAID LEDGE MEANS AND HAVING SAID OTHER PARTITION SIDE COPLANAR WITH SAID FREE END OF SAID LEDGE MEANS; AND A LOCKING MEMBER HAVING A PARTITION ENGAGING PLATE WITH ITS ENGAGING PLATE SIDE ENGAGING SAID OTHER PARTITION SIDE AND WITH A HOOK EDGE ENGAGING AND HOOKING SAID HOOK RECEIVING LEDGE MEANS, SAID LOCKING MEMBER HAVING A FULCRUM EDGE ENGAGING SAID FULCRUM RECEIVING LEDGE, SAID LOCKING MEMBER TO BE FORCIBLY DEFORMED INTO LOCKING ENGAGEMENT WITH SAID FRAME MEMBER AND PARTITION BY FIRST HAVING ITS FULCRUM EDGE ENGAGEMENT SAID FULCRUM RECEIVING LEDGE SO AS TO FULCRUM THEREAGAINST IN ORDER TO CAUSE SAID HOOK EDGE TO BE FORCED INTO HOOKING ENGAGEMENT WITH SAID HOOK RECEIVING LEDGE MEANS AND LOCK THEREWITH WHILE SAID PLATE COMPRESSES SAID PARTITION AGAINST SAID PARTITION RECEIVING FRAME SURFACE TO LOCK SAID PARTITION TO SAID FRAME MEMBER, SAID HOOK EDGE HAVING A CAM SURFACE FOR INITIALLY CAMMING ALONG SAID OTHER PARTITION SIDE AND ONTO SAID FREE END OF SAID LEDGE MEANS WITH A SMOOTH TRANSITION THEREBETWEEN WHEREBY SAID HOOK EDGE CAN THEN HOOK WITH SAID LEDGE MEANS AFTER FURTHER FULCRUMING OF SAID LOCKING MEMBER. 